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| 1979 | Jenkins, Roy |  |
| Calls for a "radical centre" durng the BBC Dimbleby Lecture |
| Uses the Dimbleby Lecture to found the SDP & strengthen the "radical centre" |
| 1981 | Foot, Michael | |
| London 28 MPs defect to the Social Democratic Party |
| 1981 | Jenkins, Roy | |
| Appointed Party Leader of the Social Democratic Party |
| 25th Jan One of the "Gang of Four", former Labour Ministers who found the SDP |
| 1981 | Owen, David | |
| 25th Jan London One of the "Gang of Four", former Labour Ministers who found the SDP |
| 1981 | Rodgers, Bill | |
| 23rd Jan London One of the "Gang of Four", former Labour Ministers who found the SDP |
| 1981 | Williams, Shirley | |
| 25th Jan London One of the "Gang of Four", former Labour Ministers who found the SDP |
| 1982 | Jenkins, Roy | |
| Glasgow Elected Member of Parliament for Hillhead |
| 1983 | Jenkins, Roy | |
| Resigns as Party Leader of the SDP |
| 1983 | Owen, David | |
| Appointed Party Leader of the SDP |
| June The Liberal-SDP Alliance win 25% of the popular vote |
| 1985 | Owen, David | |
| 2nd Sep Torquay Opening day of the SDP Conference in Torquay |
| 1987 | Jenkins, Roy | |
| Appointed Member of the House of Lords |
| 11th June Glasgow Defeated during the general election |
| 1987 | Maclennan, Robert | |
| Appointed Party Leader of the SDP |
| 1987 | Owen, David | |
| The SDP-Liberal Alliance win 22.6% of the popular vote, 7% behind Labour |
| 6th Aug London Resigns as leader of the SDP after his Party votes to merge with the Liberal Party |
| 1988 | Jenkins, Roy | |
| London Appointed Leader of the Social & Liberal Democrat Peers in the Lords |
| 1990 | Barnes, Rosie | |
| 3rd June David Owen announces the dissolution of the SDP |
| 3rd June The SDP continues as the Independent Social Democrats |
| 1990 | Cartwright, John | |
| 3rd June David Owen announces the dissolution of the SDP |
| 1990 | Owen, David | |
| 3rd June Announces the dissolution of the SDP, continues as an Independent Social Democrat |
| 14th Nov London Dissolves the SDP |
| 1997 | Jenkins, Roy | |
| 1st Dec Appointed chair of the electoral reform commission |
| 2003 | Jenkins, Roy | |
| 5th Jan Death of Roy Jenkins |
